Can you change colors every secend for text?

I wanted to know if it’s a way for me to change the color of my main menu text every sec

Sure, one way of doing this would be by running a coroutine which updates the color every second. I wrote an example class which does this and sets the color of a UnityUI Text object to a random color. I wrote this outside of Unity so its possible it has some small errors, but it should give you the general idea of how to accomplish this. You could make the _targetText an array so it affects multiple text objects, or add this script to each text object you have.

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class ColorChanger : MonoBehaviour
{
    [SerializeField]
    private Text _targetText = null;

    [SerializeField]
    private float _changeInterval = 1;

    [SerializeField]
    private Color[] _possibleColors = null;

    private void OnEnable()
    {
        // Kick off the change color routine, which is automatically stopped by OnDisable
        StartCoroutine(ChangeColorAsync());
    }

    private IEnumerator ChangeColorAsync()
    {
        // Create a wait object based on our interval, outside of loop to avoid extra allocations
        var wait = new WaitForSecondsRealtime(_changeInterval);
        while (enabled)
        {
            // Change text color to one of our possible colors
            _targetText.color = _possibleColors[Random.Range(0, _possibleColors.Length)];

            // Wait
            yield return wait;
        }
    }
}